On 06/06, Ser, Simon wrote:
> On Tue, 2019-06-04 at 23:30 -0300, Rodrigo Siqueira wrote:
> > The kms_flip test relies on VBlank support, and this situation may
> > exclude some virtual drivers to take advantage of this set of tests.
> > This commit adds a mechanism that checks if a module has VBlank. If the
> > target module has VBlank support, kms_flip will run all the VBlank
> > tests; otherwise, the VBlank tests will be skipped. Additionally, this
> > commit improves the test coverage by checks if the function
> > drmWaitVBlank() returns EOPNOTSUPP (i.e., no VBlank support).
> >
> > V7: Changes since V6
> > - Skip TEST_DPMS with TEST_MODESET and TEST_EBUSY if the device does
> > not support vblank
>
> Hmm, I'm not sure I understand this line. If I'm reading this correctly
> it refers to this line:
>
> if (!(o->flags & (TEST_DPMS | TEST_MODESET | TEST_NO_VBLANK)))
>
> So the check was previously skipped on TEST_DPMS and TEST_MODESET. It's
> now skipped on TEST_NO_VBLANK too. So I'm a little confused with the
> changelog line: should it say "skip seq number checking it the device
> doesn't support vblank"?
>
> Am I missing something?
>
> Apart from this, the patch itself looks good to me.
Hi Simon,
Thank you for your review.
About the changelog message, I'll update it to:
Skip seq number checking and busy flip if the device doesn't support vblank
Can I add your Reviewed-by before applying this patch?
> > V6: Set errno to zero before call drmWaitVBlank() (Chris Wilson)
> >
> > V5: Drop the DRM_VBLANK_NEXTONMISS (Chris Wilson)
> >
> > V4: Replace DRM_VBLANK_ABSOLUTE by DRM_VBLANK_RELATIVE and
> > DRM_VBLANK_NEXTONMISS
> >
> > V3: Add documentation (Daniel Vetter)
> >
> > V2: Add new branch coverage to check if VBlank is enabled or not and
> > update commit message
> >
> > V1: Chris Wilson
> > - Change function name from igt_there_is_vblank to kms_has_vblank
> > - Move vblank function check from igt_aux to igt_kms
> > - Utilizes memset in dummy_vbl variable
> > - Directly return the result of drmWaitVBlank()
> >
> > Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@xxxxxxxxx>
> > ---
> > lib/igt_kms.c | 21 +++++++++++++++++++++
> > lib/igt_kms.h | 2 ++
> > tests/kms_flip.c | 24 +++++++++++++++++++++++-
> > 3 files changed, 46 insertions(+), 1 deletion(-)
> >
> > diff --git a/lib/igt_kms.c b/lib/igt_kms.c
> > index d7d711a7..8a465f67 100644
> > --- a/lib/igt_kms.c
> > +++ b/lib/igt_kms.c
> > @@ -1673,6 +1673,27 @@ void igt_assert_plane_visible(int fd, enum pipe pipe, int plane_index, bool visi
> > igt_assert_eq(visible, visibility);
> > }
> >
> > +/**
> > + * kms_has_vblank:
> > + * @fd: DRM fd
> > + *
> > + * Get the VBlank errno after an attempt to call drmWaitVBlank(). This
> > + * function is useful for checking if a driver has support or not for VBlank.
> > + *
> > + * Returns: true if target driver has VBlank support, otherwise return false.
> > + */
> > +bool kms_has_vblank(int fd)
> > +{
> > + drmVBlank dummy_vbl;
> > +
> > + memset(&dummy_vbl, 0, sizeof(drmVBlank));
> > + dummy_vbl.request.type = DRM_VBLANK_RELATIVE;
> > +
> > + errno = 0;
> > + drmWaitVBlank(fd, &dummy_vbl);
> > + return (errno != EOPNOTSUPP);
> > +}
> > +
> > /*
> > * A small modeset API
> > */
> > diff --git a/lib/igt_kms.h b/lib/igt_kms.h
> > index 4ac28131..5b5cf274 100644
> > --- a/lib/igt_kms.h
> > +++ b/lib/igt_kms.h
> > @@ -229,6 +229,8 @@ void kmstest_wait_for_pageflip(int fd);
> > unsigned int kmstest_get_vblank(int fd, int pipe, unsigned int flags);
> > void igt_assert_plane_visible(int fd, enum pipe pipe, int plane_index, bool visibility);
> >
> > +bool kms_has_vblank(int fd);
> > +
> > /*
> > * A small modeset API
> > */
> > diff --git a/tests/kms_flip.c b/tests/kms_flip.c
> > index d7c1f9cf..2a158d97 100755
> > --- a/tests/kms_flip.c
> > +++ b/tests/kms_flip.c
> > @@ -71,6 +71,7 @@
> > #define TEST_SUSPEND (1 << 26)
> > #define TEST_BO_TOOBIG (1 << 28)
> >
> > +#define TEST_NO_VBLANK (1 << 29)
> > #define TEST_BASIC (1 << 30)
> >
> > #define EVENT_FLIP (1 << 0)
> > @@ -126,6 +127,18 @@ struct event_state {
> > int seq_step;
> > };
> >
> > +static bool vblank_dependence(int flags)
> > +{
> > + int vblank_flags = TEST_VBLANK | TEST_VBLANK_BLOCK |
> > + TEST_VBLANK_ABSOLUTE | TEST_VBLANK_EXPIRED_SEQ |
> > + TEST_CHECK_TS | TEST_VBLANK_RACE | TEST_EBUSY;
> > +
> > + if (flags & vblank_flags)
> > + return true;
> > +
> > + return false;
> > +}
> > +
> > static float timeval_float(const struct timeval *tv)
> > {
> > return tv->tv_sec + tv->tv_usec / 1000000.0f;
> > @@ -494,7 +507,7 @@ static void check_state(const struct test_output *o, const struct event_state *e
> > /* check only valid if no modeset happens in between, that increments by
> > * (1 << 23) on each step. This bounding matches the one in
> > * DRM_IOCTL_WAIT_VBLANK. */
> > - if (!(o->flags & (TEST_DPMS | TEST_MODESET)))
> > + if (!(o->flags & (TEST_DPMS | TEST_MODESET | TEST_NO_VBLANK)))
> > igt_assert_f(es->current_seq - (es->last_seq + o->seq_step) <= 1UL << 23,
> > "unexpected %s seq %u, should be >= %u\n",
> > es->name, es->current_seq, es->last_seq + o->seq_step);
> > @@ -1176,6 +1189,7 @@ static void run_test_on_crtc_set(struct test_output *o, int *crtc_idxs,
> > unsigned bo_size = 0;
> > uint64_t tiling;
> > int i;
> > + bool vblank = true;
> >
> > switch (crtc_count) {
> > case RUN_TEST:
> > @@ -1259,6 +1273,14 @@ static void run_test_on_crtc_set(struct test_output *o, int *crtc_idxs,
> > }
> > igt_assert(fb_is_bound(o, o->fb_ids[0]));
> >
> > + vblank = kms_has_vblank(drm_fd);
> > + if (!vblank) {
> > + if (vblank_dependence(o->flags))
> > + igt_require_f(vblank, "There is no VBlank\n");
> > + else
> > + o->flags |= TEST_NO_VBLANK;
> > + }
> > +
> > /* quiescent the hw a bit so ensure we don't miss a single frame */
> > if (o->flags & TEST_CHECK_TS)
> > calibrate_ts(o, crtc_idxs[0]);
--
Rodrigo Siqueira
https://siqueira.tech
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